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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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